Printing machine



Nov. 28, 1933. c. cs. KRANZ PRINTING MACHINE Original Filed Nov. 1. 1929 Patented Nov. 28, 1933 UNITED STATES PATENT OFFICE PRINTING MACHINE Curtis George Kranz, Chicago, 111., assignor to Addressograph Company, Chicago, 111., a corporation of Delaware 8 Claims.

- the blanket in order that it may be arranged in taut condi ion; and to provide an impression cylinder with which a make-ready may be used when required.

In the selected embodiment of my invention '15 illustrated in the accompanying drawing Fig. 1 is a side view of my improved impression cylinder;

Fig. 2 is a sectional detail view; and Fig. 3 is a sectional detail taken substantially on the line 3--3 on Fig. 2.

In the accompanying drawing I have illus'rated my improved impression cylinder as used in a printing couple in connection with a printing cylinder of the character described and claimed in my co-pending application, Serial No. 511,707, filed January 28, 1931, and such a printing couple is used in connection with a printing machine of the kind described and claimed in the application from which this application has been divided. The printing cylinder and the plafen or impresslon cylinder of this invention will preferably be operated in synchronism. The impression cylinder is indicated by 4 and is suitably mounted on a shaft 5 to be rotatable therewith. On the periphery of the cylinder is a wide flange 6 including an enlarged portion 7 and a formed portion 8 which are arranged in spaced relation 10 define therebetween a recess 9. The formed portion 8 provides an outwardly opening recess 10 having an inclined edge 11. A wedge block 12 includes an inclined edge 13 adapted to cooperate with the inclined edge 11 when one end of a cushion blanket 14 arranged on the periphery of the flange 6 is disposed between the wall of 5 the recess 10 and the edge of the block 12 opposite the inclined edge 13. Screws 15 pass freely through the block 12 and into the formed portion 8 and by tightening these screws the block 12 may be moved inwardly and by reason of the cooperation of the inclined edges 11 and 13 the end of the blanket will be tightly secured to prevent displacement thereof. The blanket 14 is directed around the periphery of the flange 6 and the free end thereof is extended into the recess 9. In the recess 9 is a block 16 having a projection 17 on one face thereof and the end of the blanket 14 is directed over this face into engagement wi h the shoulder defined by the projection 17. Another block 18 is then rested on the blanket and the screws 19 are freely passed through the w block 18 and the blanket and into the block 16 to thereby securely clamp this end of the blanket to .he block. At opposite ends of the block 18, cars 20 are formed and on the face of. the formed portion 8, providing a wall of the recess 9, grooves 5 21 are formed at the outer edges in which the ears 20 are disposed, and the cooperating engagement of these cars with the grooves 21 prevent endwise movement of the block 18 and consequently Lhe block 16 which is secured thereto, and in this manner this end of the blanket is secured and properly positioned on the periphery of the flange 6. On the face of the block 16, opposite that having the end of the blanket disposed thereon, a rack 22 is provided. In the enlarged portion 7 is an opening 23 in 0 which an elongated pinion 24 is passed and the teeth of this pinion mesh with the teeth of the rack 22. A groove isformed in the periphery of the pinion 24 and a pin 26 is passed through this groove to thereby prevent 3o axial displacement of the pinion 24 from the opening 23. A: one end of the pinion 24, a ratchet 27 is formed of substantially the same diameter as the pinion and this ratchet is arranged to partially extend into the opening 23 and is se- 5 cured to the pinion 24 by being pinned, as indicated at 28, or in any other suitable manner. A. one end of the pinion 24 a tool grip 29 is provided and by connecting a suitable tool to this tool grip the pinion 24 may be rotated and when turned 0 in a clockwise direction this pinion will act on the rack 22 to move the blocks 16 and 18 inwardly to thereby tension the blanket 14. A pawl 30 piv-, otally mounted at 31 is acted on by a spring 32 and normally engages the teeth of the ratchet 27, and 5 this prevents unloosening movement to thereby retain the rack 22 in any position into which it is moved by manipulation of the pinion 24. Manifestly, a make-ready may be easily associated with the blanket by merely moving the pawl 30 from engagement with the ratchet 27 after which the blocks 16 and 18 may be moved from the recess 9, and after the make-ready has been arranged in position ihe blocks will again be passed into the recess and the rack 22 meshed with the pinion 24 106 aftter which the pinion will be turned in the manner described to again bring the blanket into taut condition on the periphery of the flange 6. In order that access may also be had to the pawl 30 and the end of the pinion 24 having ihe tool 110 grip 29 thereon, I lock the cylinder 4 to the shaft 5 by a dog 33 mounted on the hub of the cylinder and engaging a recess in the collar 34 fixed to the shaft. The dog may be manually operated to release the cylinder from the shaft so that it can be turned into any desired position for adjusting or replacing the blanket. However, since connection will be made to the shaft by the dog 33 en-' gaging the recess in the collar 34 it is manifest that the relation between the platen cylinder and the printing cylinder may be maintained and thus proper synchronic operation thereof may be brought about.

While I have illustrated and described a selected embodiment of myinvention, it is to be understood that ihis is capable of variation and modification and I do not wish to be limited to the precise details set forth but desire to avail myself of such changes and alterations as fall within the purview of the following claims:

I claim:

1. In a prin-ling machine, a platen cylinder having a recess therein, a cushion blanket, means securing one end of said blanket to said cylinder, clamp means securing the other end of said blanket and disposed in said recess, a rack on said clamp'means, and a pinion meshed with said rack and rotatable to move said clamp means through said recess to tighten said blanket on said cylinder.

2. In a printing machine, a platen cylinder having a recess therein, a cushion blanket, means securing one end of said blanket to the cylinder, "clamp means secured to the other end of the blanket and disposed in said recess, a rack, a pinion meshed with said rack and rotatable to move said clamp means through said recess to tighten said blanket on said cylinder, and releasable means holding said pinion against roiation to hold said blanket tight on said cylinder.

3. In a printing machine, a platen cylinder having a recess therein, a cushion blanket, means securing one end of said blanket to the cylinder, clamp means secured to the other end of said blanket and disposed in said recess, a rack on said clamp means, anda pinion rotatably mounted in said cylinder and meshed with said rack and rotatable to move said clamp means through said recess to tighten said blanket on said cylinder.

4. In a printing machine, a platen cylinder having a recess therein, a cushion blanket, means securing one end of said blanket to the cylinder, clamp means secured to the other end of said blanket and disposed in said recess, a rack on said clamp means, a pinion rotatably mounted in said cylinder and meshed with said rack to move said clamp means through said recess to tighten said blanket on said cylinder, and means for holding said pinion against unloosening movement.

5. In a printing machine, a platen cylinder having a recess therein, a cushion blanket, means securing one end of said blanket to the cylinder,

'clamp means secured to the other end of said ment, and means urging said pawl into holding position.

6. In a printing machine, a platen cylinder having a formed portion providing a pocket having an inclined edge, a cushion blanket having one end thereof extended into said pocket, a block having an inclined tapered edge adapted for cooperation with said inclined edge, means for securing said block in said pocket with the tapered edge thereon in engagement with the tapered edge of the pocket to clamp said end of the blanket between said block and the wall of the pocket. opposite said inclined edge to thereby secure said end of said blanket to the cylinder, and means for adjustably securing the other end of said blanket to the cylinder to vary the tension of said blanket on said cylinder.

7. In a printing machine which has a platen cylinder, a cushion blanket on said cylinder, and means on the cylinder for tightening the blanket thereon, the combination therewith of a shaft, a releasable locking member, and means engageable in the locking member for connecting the cylinder to the shaft, said locking means being released to permit the cylinder to be turned to a convenient position for manipulating said tightening means.

8. In a printing machine which has a platen cylinder, a cushion blanket on said cylinder, and means on the cylinder for tightening the blanket thereon, the combination therewith of a shaft, a releasable locking member on the cylinder, means on the shaft engageable by the locking member to connect the cylinder to the shaft, and means urging the releasable locking member into engagement with the means on the shaft to be engaged thereby, said locking member being released to permit the cylinder to be turned to a convenient position for manipulating said tightening means.

CURTIS GEORGE KRANZ. 

